What are the common factors of 77?

There are no common factors of 77 because there cannot be common factors without two or more numbers to compare. Common factors are factors that the numbers being compared have in common.

Examples:

The common factors of 14 and 77 are 1 and 7.

The common factors of 66 and 77 are 1 and 11.

The common factors of 77 and 154 are 1, 7, 11, and 77.